I started making a mod and have only just wanted to open the client and it doesn't open?

 

[13:57:36] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.CoremodTweaker
[13:57:36] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.fml.relauncher.FMLCorePlugin
[13:57:36] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.classloading.FMLForgePlugin
[13:57:36] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[13:57:36] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[13:57:36] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
[13:57:36] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[13:57:36] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[13:57:36] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[13:57:37] [main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing
[13:57:37] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[13:57:37] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[13:57:38] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
[13:57:38] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
[13:57:38] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
[13:57:38] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[13:57:38] [main/ERROR] [LaunchWrapper]: Unable to launch
java.lang.reflect.InvocationTargetException: null
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_242]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_242]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_242]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_242]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_242]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_242]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_242]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_242]
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?]
	at GradleStart.main(GradleStart.java:25) [start/:?]
Caused by: java.lang.ExceptionInInitializerError
	at net.minecraft.client.Minecraft.getSystemTime(Minecraft.java:3159) ~[Minecraft.class:?]
	at net.minecraft.client.main.Main.main(Main.java:42) ~[Main.class:?]
	... 12 more
Caused by: java.lang.NullPointerException
	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1847) ~[?:1.8.0_242]
	at java.lang.Runtime.loadLibrary0(Runtime.java:871) ~[?:1.8.0_242]
	at java.lang.System.loadLibrary(System.java:1124) ~[?:1.8.0_242]
	at org.lwjgl.Sys$1.run(Sys.java:72) ~[lwjgl-2.9.4-nightly-20150209.jar:?]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_242]
	at org.lwjgl.Sys.doLoadLibrary(Sys.java:66) ~[lwjgl-2.9.4-nightly-20150209.jar:?]
	at org.lwjgl.Sys.loadLibrary(Sys.java:87) ~[lwjgl-2.9.4-nightly-20150209.jar:?]
	at org.lwjgl.Sys.<clinit>(Sys.java:117) ~[lwjgl-2.9.4-nightly-20150209.jar:?]
	at net.minecraft.client.Minecraft.getSystemTime(Minecraft.java:3159) ~[Minecraft.class:?]
	at net.minecraft.client.main.Main.main(Main.java:42) ~[Main.class:?]
	... 12 more
Exception in thread "main" [13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: java.lang.reflect.InvocationTargetException
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at java.lang.reflect.Method.invoke(Method.java:498)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at GradleStart.main(GradleStart.java:25)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: Caused by: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at java.lang.Runtime.exit(Runtime.java:108)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at java.lang.System.exit(System.java:973)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[13:57:38] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: 	... 6 more
OpenJDK 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

 

Edited February 1, 20205 yr by TheCrudNation

I'm using the latest version of FML 1.12.2